package com.bdqn.config;


import com.bdqn.pojo.User;
import com.bdqn.service.IUserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

public class MyShiroRealm extends AuthorizingRealm { //安全数据源
    @Resource
    private IUserService userService;

    @Resource
    private StringRedisTemplate stringRedisTemplate;//redis中数据的key的前缀
    private String SHIRO_LOGIN_COUNT = "shiro_login_count_";//登录计数
    private String SHIRO_IS_LOCK = "shiro_is_lock_"; //锁定用户登录

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        System.out.println("调用MyShiroRealm.doGetAuthenticationInfo获取身份信息！");
        //获得身份信息
        UsernamePasswordToken token = (UsernamePasswordToken) authenticationToken;
        String usrName = token.getUsername();
        //每次访问，登录次数+1
        ValueOperations<String, String> opsForValue = stringRedisTemplate.opsForValue();
        opsForValue.increment(SHIRO_LOGIN_COUNT + usrName, 1);
        //计数大于5时，设置用户被锁定一小时，清空登录计数
        if (Integer.parseInt(opsForValue.get(SHIRO_LOGIN_COUNT + usrName)) > 5) {
        }
        opsForValue.set(SHIRO_IS_LOCK + usrName, "LOCK");
        stringRedisTemplate.expire(SHIRO_IS_LOCK + usrName, 1, TimeUnit.HOURS);
        stringRedisTemplate.delete(SHIRO_LOGIN_COUNT + usrName); //清空登录计数
        if ("LOCK".equals(opsForValue.get(SHIRO_IS_LOCK + usrName))) {
            throw new DisabledAccountException();
        }
        User user = userService.getUserByUsrName(usrName);
        if (user == null) {
            throw new UnknownAccountException(); //账号错误
        }
        if (user.getUsrFlag() == null || user.getUsrFlag().intValue() == 0) {
            throw new LockedAccountException(); //账号锁定
        }

        SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(user,//身份(根据用户名查询数据库获得的用户)
                user.getUsrPassword(),//凭证(查询数据库获得的密码)
                ByteSource.Util.bytes("czkt"),//加密使用的salt
                getName()//Realm对象的名称
        );
        return info;
    }

    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        System.out.println("调用MyShiroRealm.doGetAuthorizationInfo获取权限信息！");
        //获得权限信息
        User user = (User) principalCollection.getPrimaryPrincipal();
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        //静态授权：授予主体(用户)相应的角色和权限
        info.addRole(user.getRole().getRoleName());
        info.addStringPermission("用户列表");//所有用户拥有"用户列表"权限
        if ("管理员".equals(user.getRole().getRoleName())) {//管理员拥有"增删改"权限
            info.addStringPermission("用户添加");
            info.addStringPermission("用户编辑");
            info.addStringPermission("用户删除");
        }
        return info;
    }

    //清空当前认证用户权限缓存
    public void clearMyCachedAuthorizationInfo() {
        clearCachedAuthorizationInfo(SecurityUtils.getSubject().getPrincipals());
    }
    //清空所有用户权限缓存
    public void clearAllCachedAuthorizationInfo() {
        if (this.isAuthorizationCachingEnabled()) {
            //权限缓存是否可用
            Cache<Object, AuthorizationInfo> cache = null;
            CacheManager cacheManager = this.getCacheManager();
            if (cacheManager != null) {
                String cacheName = this.getAuthorizationCacheName();//获得权限缓存名称
                cache = cacheManager.getCache(cacheName);//获得权限缓存
            }
            if (cache != null) {
                cache.clear();
            }
        }
    }
}